According to the OP, 2700 shard perks reward more BPs per shard than 2000 shard perks.

However, unless you have all the perks, characters and cosmetics you want already and nothing better to do with your shards, I wouldn't recommend using the Shrine as a converter because it would be a waste of your shards. In terms of the time it takes to get 2000 shards compared to several hundred bloodpoints, the two are nowhere near being equal in value.